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synchronous converter[′siŋ·krə·nəs kən′vərd·ər]
A synchronous machine used to convert alternating current (ac) to direct current (dc), or vice versa. The ac-to-dc converter has been superseded by the mercury arc rectifier (for reasons of efficiency, lower maintenance costs, and less trouble) or by motor-generator sets. Converters are no longer manufactured, but there are converters still in use. See Direct-current generator, Synchronous motor